* {
    margin: 0;
    padding: 0;
    }
    
    ul, li, ol {
        list-style: none;
    }
    
    a, a:hover, a:visited, a:link, a:active {
        text-decoration: none;
        color: #333;
    }
    
    .clearFix::after, .clearFix::before {
        content: '';
        display: block;
        clear: both;
    }
    
    div.banner {
        width: 600px;
        height: 400px;
        border: 3px solid #333;
        margin: 30px auto;
        position: relative;
    
        overflow: hidden;
    }
    
    .banner > ul {
        width: 500%;
        height: 100%;
        background-color: pink;
    
        position: absolute;
        top: 0;
        left: 0;
    }
    
    .banner > ul > li {
    width: 600px;
    height: 100%;
    float: left;
    
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    font-size: 100px;
    }
    
    .banner > ol {
        width: 50%;
    height: 20px;
    position: absolute;
    background-color: rgba(0, 0, 0, .4);
    border-radius: 10px;
    
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    
    display: flex;
    justify-content: space-evenly;
    align-items: center;
    }
    
    .banner > ol > li {
    width: 10px;
    height: 10px;
    background-color: #fff;
    border-radius: 50%;
    cursor: pointer;
    }
    
    .banner > ol > li.active {
    background-color: skyblue;
    }
    
    .banner > div {
    width: 100%;
    height: 40px;
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    
    display: flex;
    justify-content: space-between;
    align-items: center;
    }
    
    .banner > div > a {
    width: 20px;
    height: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    background-color: rgba(0, 0, 0, .4);
    }